hofmarkus at gmail
Aug 25, 2011, 6:03 AM
[lvs-users] One realserver must connect to services to other realservers (routing problem).
i have a question about the connection of one (or in future more)
realserver to services
to other realserver.
The problem is that when i would connect from one realserver (A) to a
other servive on a other
realserver (B) the connection go to the LVS-Box (in my case keepalived
loadbalancer) and then
to the other realserver (B).
My loadbalance ist keepalived with NAT.
Tomcat Service on Realserver A with external IP (VIP) 192.168.200.15)
Loadbalancer (LVS) (IP 192.168.200.15)
REALSERVER (A) REALSERVER (B)
The problem is, that realserver B see that the question for the service
comes from the network 192.168.0.10 and then goes
directly to A, but couldn't work out the answer, because realserver A
ask 192.168.200.15 and not 192.168.0.10.
My work around for this problem is:
- in the hostfile i make a other local entry for the tomcat-service. So
realserver A ask realserver B directly and not
over LVS. But this is very complicate, because I must insert all
DNS-entry local to this realserver A.
My qustion is how I could work around this without other new DNS entries?
If the realserver go outside for services i have insert a SNAT on
POSTROUTING on the LVS.
I think i could make some somethink like that if one realserver must
connect to one other realserver, but I think
this SNAT i must insert in the PREROUTING?
It not easy to make changes on a service ONLINE and so i would ask the
LVS Users Mailing List if someone could help me.
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